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Non-Controlling Interests - Earnings of Subsidiaries with Non-Controlling Interests (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of subsidiaries [line items] |  |  |
Revenues | $ 2,101 | $ 2,347 | $ 2,249
Net earnings (loss) | (253) | 176 | (90)
Total comprehensive income (loss) | (355) | 131 | (86)
Amounts attributable to the non-controlling interests: |  |  |
Net earnings (loss) | 34 | 94 | 108
Total comprehensive income (loss) | 84 | 77 | 124
TransAlta Renewables Inc. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 436 | 446 | 462
Net earnings (loss) | 97 | 183 | 241
Total comprehensive income (loss) | 223 | 138 | 281
Amounts attributable to the non-controlling interests: |  |  |
Net earnings (loss) | 40 | 73 | 94
Total comprehensive income (loss) | 90 | 56 | 110
Distributions paid to Canadian Power Holdings Inc. | 80 | 69 | 79
TransAlta Cogeneration, L.P. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Revenues | 146 | 181 | 185
Net earnings (loss) | (13) | 43 | 29
Total comprehensive income (loss) | (13) | 43 | 29
Amounts attributable to the non-controlling interests: |  |  |
Net earnings (loss) | (6) | 21 | 14
Total comprehensive income (loss) | (6) | 21 | 14
Distributions paid to Canadian Power Holdings Inc. | $ 17 | $ 37 | $ 86

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